Organic Tandem Solar Cells with 15% Efficiency Employing Novel Wide Bandgap Nonfullerene Acceptor

Yuliar Firdaus^a, Qiao He^b, Yuanbao Lin^a, Ferry Anggoro Ardy Nugroho^c, Emre Yengel^a, Ahmed H. Balawi^a, Frederic Laquai^a, Christoph Langhammer^c, Feng Liu^d, Martin Heeney^b, Thomas D. Anthopoulos^a

^aKing Abdullah University of Science and Technology (KAUST) - Saudi Arabia, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia

^bDepartment of Chemistry and Centre for Plastic Electronics, Imperial College London, South Kensington Campus, London, United Kingdom

^cChalmers University of Technology, Sweden, Fysikgränd, 3, Gothenburg, Sweden

^dShanghai Jiao Tong University, CN

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)

Tsukuba-shi, Japan, 2020 January 20th - 22nd

Organizers: Michio Kondo and Takurou Murakami

Oral, Yuliar Firdaus, presentation 043
DOI: https://doi.org/10.29363/nanoge.iperop.2020.043
Publication date: 14th October 2019

Fabricating solar cells with tandem structure is an effective way for increasing the power conversion efficiency (PCE) beyond that of single-junction organic photovoltaics (OPV). To obtain high PCE of the tandem OPV, carefully engineered front-cell and back-cell are required. However, wide-bandgap materials for front cells that have both high short-circuit current density (J_SC) and open-circuit voltage (V_OC) are scarce. In this contribution, we developed and studied two new acceptor molecules namely IDTA and IDTTA with optical bandgaps (E_g^opt) of 1.90 and 1.75 eV, respectively. When blended with wide bandgap polymer PBDB-T, single-junction cells with PCE up to 7.4% for IDTA and 10.8% for IDTTA (with high V_OC = 0.98 V, J_SC = 15.8 mAcm^-2, and FF = 70%) are demonstrated. The latter PCE value is the highest reported to date for wide-bandgap (E_g^opt ≥ 1.7 eV) OPVs. Our detailed transport and recombination studies show that the improved charge transport in IDTTA-based cells leads to higher fill-factor and improved charge generation than IDTA-based devices. Moreover, IDTTA-based OPVs show improved shelf lifetime and thermal stability. Nanoplasmonic spectroscopy analysis reveals that the PBDB-T:IDTTA layer exhibits significantly higher glass transition temperature, which could explain its superior thermal stability at 80°C. Finally, with the aid of optical-electrical device simulation, we were able to combine PBDB-T:IDTTA as the front-cell with PTB7-Th:IEICO-4F as the back-cell in tandem OPVs and demonstrate cells with PCE = 15%, open circuit voltage of 1.66 V and short circuit current of 13.6 mA/cm²; in good agreement with our theoretical predictions. These results highlight IDTTA as a promising acceptor for high performance tandem OPVs.

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